The Design Of Intelligent Elevator Control System Based On FPGA

The paper is about the design of intelligent elevator control system based onFPGA according to the up speeding pace of urbanization and a rapid increase indemand for elevators in public places like a high-rise building. The research mainlyfocuses on the elevator control circuit and show utility value in its flied. The averageannual output growth of China’s elevator inflation rate has remained above35%, it willremain the core of the global elevator equipment manufacturer and the largest nationalelevator use for a long time, but China’s own brands account only for30%of themarket share comparing the total annual production value of more than the onehundred billion yuan, most of the elevator deficiencies in terms of securitymanagement and intelligent. To change this situation, explore a low-power, intelligent,and more highly quality, efficient, comfortable and safe elevator system, a newfingerprint recognition technology as an important means to improve competition hasbeen used to achieve the design of elevator door open and closed. It has the feature thatan elevator just stays in the fingerprint corresponding layer and the different floors ofsuch housing or the company will not be interfered with each other, so it shows a goodinnovation.The whole system uses the modular design of UP TO DOWN, the status ofdomestic elevator market and technological development were studied, a shortdevelopment cycle, lower design costs, design flexibility for stability advantages hasbeen proposed to improve the performance of the elevator control system solutions forthe current users of the elevator control section using ammonium button moreproblematic failure in the control part by Altera’s Cyclone Ⅱ series FPGA chip. Withthe Verilog-HDL hardware description language to complete the functional design ofthe system, consist of controller module, virtual module, input module and displaymodule.The main task of the elevator control system requirements are as follows: first ofall, as the elevator control system to achieve the basic functions of all the buttons inresponse to the elevator and outside requests, including instructions and external callbox to summon instructions inside the car, each unexecuted Instruction will beautomatically stored to the register, and follow the direction of the elevator priority principle, in order to respond until after the completion of the instruction executionelimination; Secondly, call control switch device, the initial layer is controlled by thefingerprint reader elevator door switches, and fingerprint information of the originalinput fingerprint matching fingerprint database, control the elevator directly to the setof floor space on each floor to isolate and reduce unnecessary personnel into the goal,the middle layer outbound systems are up and down buttons, the top only set downbutton; once again, according to the instruction of the elevator control systemrequirements determine the direction of their own, such as the same time period, whilethe presence of the vertical signal line operation, the elevator will be finished in thesame direction in response to the priority of the command signal, and thenautomatically responds to the other Run command in one direction; Lastly, If thecurrent instruction and the car outbound command does not exist, the elevator will turnitself off within a set time the elevator doors and car lighting system back to a waitingstate.The research is mainly reflected in the following four parts. Firstly, FPGAtechnology and fingerprint recognition technology has been studied, and as a basis forthe design of the elevator control core part, including key denounce processing,fingerprint analysis, judgment floor, running state detection, up and down control, doorcontrol switch, status display, some overweight alarm, lighting fixtures. By running thefinite state machine, controller module can control the action of elevator. Secondly, thevirtual elevator module is designed to achieve the functional of elevator controllersimulation, the main virtual elevator doors down the line and switch action and thenormal operation of the elevator drive controller. Virtual elevator includes the elevatorfloor registers, to simulate the elevator current state and fed the output signal to elevatorcontroller to drive the normal operation. Thirdly, the design tends to use Biovo-C2fingerprint recognition module after comparing the key input pattern and fingerprintpattern to limit user privileges elevator, security building safe and convenient access tothe property for better personnel information management. By the process of fingerprintlogon and fingerprint match to limit the elevator user’s rights, if the fingerprint databasehas relevant fingerprint records, they will send the information to floor judgment module;If there is no fingerprint stored information, it will not send commands to open the door,so as to protect the safety of buildings effectively. Fourthly, elevator display moduleincludes the parts of the elevator operation and elevator door open or close by drivingLED. Lastly, writing the hardware code with Verilog hardware description language,download code to the chip with professional download cable after compiling and debugging the environment of integrated software. The simulation results after testinghave proved the system is reliable and safe enough to reach the design goals in thebeginning.